Posted by Jacob on Sunday, September 30, 2007 at 4:28pm.
My teacher showed our class how to find the graph of a derivative using tangent lines. I can not figure this out.
I would really appreciate it if someone could help me or explain it to me.
Thank you very much for your help.

Calculus  drwls, Sunday, September 30, 2007 at 4:40pm
The slope of a straignt tangent line at any point of a y(x) curve is the derivative of the y(x) function at that point.
To get the derivative this way, you would have to draw a series of tangent lines at diffent points of the curve, measure the slope of each line, and replot the derivative function (slope vs. x) using those measured points. 
Calculus  Jacob, Sunday, September 30, 2007 at 5:27pm
Thank you very much, drwls.
I actually understand it now!
(You saved me in Calculus!) :)